Hand hygiene is to be used in the following situations by imaging professionals in the workplace.

Correct Answer: D

Rationale: Hand hygiene is crucial in healthcare settings to prevent the spread of infections. Imaging professionals, like all healthcare workers, should practice hand hygiene in various situations. Before caring for a patient, hand hygiene is necessary to minimize the risk of transmitting microorganisms from the hands to the patient. After caring for a patient, hand hygiene is essential to remove any potential contaminants from the hands. When preparing for an invasive procedure, hand hygiene is crucial to prevent the introduction of microorganisms into the patient's body. Therefore, the correct answer is 1, 2, and 3.

Correct Answer: B

Rationale: The chain of infection consists of six key elements: the infectious agent (implied), reservoir, portal of exit, means of transmission, portal of entry, and susceptible host. Options A, C, D, F, H, and I align with these components.

Correct Answer: D

Rationale: Indinavir, a protease inhibitor, can interact with midazolam (a CYP3A4 substrate), increasing its levels and risk of prolonged sedation. This pharmacokinetic interaction is well-known.

Correct Answer: D

Rationale: Gas on X-ray is characteristic of gas gangrene (Clostridium perfringens), but not all gangrene (e.g., dry or wet gangrene) requires it, making this statement false.

Correct Answer: A

Rationale: Rivers' EGDT protocol does not routinely recommend hydrocortisone; it focuses on fluids, vasopressors, and dobutamine for hemodynamic goals.